CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net loss	$ (10,781)	$ (36,980)	$ (18,764)	$ (63,556)
Other comprehensive income (loss):
Foreign currency translation adjustment	2	(1,749)	2	(174)
Unrealized gain (loss) on marketable securities, net of tax	134	36	38	84
Total comprehensive loss	$ (10,645)	$ (38,693)	$ (18,724)	$ (63,646)